Do you know the difference between nearsighted and farsighted vision? Honestly, I haven’t always known the difference. Which one means when you can see things from afar? What about when you can see them up close? The names help somewhat, once you know the definitions at least. When first read, however, those names need explanation.
The names of the two refer to when the sufferer sees well.
- What is Farsighted Vision?: Farsightedness, or hyperopia, is a condition in which the sufferer sees well far off and poorly up close.
- What is Nearsighted Vision?: Nearsightedness, or myopia, is a condition in which the sufferer sees well up close and poorly far off.
- Normal Vision: Light focuses directly on the retina, neither in front of or behind it.
- Farsighted Vision: Light and visual image focuses behind the retina. The eye of a farsighted individual is shorter than normal.
- Nearsighted Vision: Light and visual image focuses in front of the retina. The eye of a nearsighted individual is stretched longer than normal.
Stated altogether, normal vision’s retina interacts normally and directly with light; farsighted and nearsighted vision’s retinas interact abnormally and indirectly with light. When the eye interacts with light normally there’s no issue with blurring. When the eye interacts with light abnormally it causes blurring either from afar or up close, depending on where the interaction takes place.
The exact cause of either condition has not been completely discovered. Some theories and scientifically supported contributing factors, however, are accepted.
- Genetic: For both nearsighted and farsighted, the most common cause is genetic. Through a series of genetic factors, a child receives from its parents a predisposition for farsightedness. The genes for each have, to some extent, been identified. Genetic treatment for either condition, however, still does not exist.
- Environmental: While likely also the case for farsightedness, environmental factors have been proven in studies for nearsightedness. For example, close up reading, frequent use of personal electronic devices, and similar activities requiring your eyes to focus up close for a long period of time.
- Corrective Lenses: Obviously the type of lenses in both cases differ, but corrective lenses make these conditions manageable. Many individuals live much of their lives with eye problems managed with glasses or contacts. Most anyone suffering from one of these issues can use glasses to correct it.
- Lasik Surgery: Corrective laser eye surgery, typically Lasik brand, is available in many cases. This surgery physically corrects the disorder causing the visual problem.
Eye problems, particularly myopia, have been linked to blue light exposure from digital devices. Even beyond this connection, myopia has simply increased over time. The eye issues arising from blue light are well noted. If you’re concerned about your eye health (given your presence on this blog post, we can assume you are), then you should learn more today. Find out what blue light is, and what it does to your eyes.